| Immediate effects of 2 different whole-body vibration frequencies on muscle peak torque and stiffness. | |
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MedLine Citation:
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PMID: 20875522 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To examine the immediate effects of 2 vibration protocols with different vibration frequencies that yielded the same maximum acceleration (106.75ms(-2)) on muscle peak torque and stiffness of knee extensor and flexor. DESIGN: Randomized crossover study with repeated measures. SETTING: Laboratory setting. PARTICIPANTS: Recreationally active male adults (N=10). INTERVENTION: Participants performed 10 bouts of 60-second static half squats intermitted with a 60-second rest period between bouts on a platform with no vibration (control) and a vibration frequency of 26Hz or 40Hz. MAIN OUTCOME MEASURES: Concentric and eccentric peak torques of knee extensor and flexor were examined within 5 minutes before and after vibration by isokinetic test. Young's modulus as an index of tissue stiffness was determined at quadriceps and hamstring pre- and postvibration by using an ultrasound indentation method. RESULTS: The 2-way repeated-measures analysis of variance indicated a significant interaction effect between vibration and vibration frequency for knee extensor concentric peak torque (P=.003). The vibration-induced changes of knee extensor concentric peak torque in vibration frequency of 26Hz (14.5Nm) and 40Hz (12.0Nm) were found to be significantly greater than that in controls (-29.4Nm) (P<.05). The change in eccentric peak torque of knee flexor after vibration tended to be greater in 26Hz of vibration frequency when compared with controls (26Hz of vibration frequency vs controls: 13.9±7.1 vs -11.4±5.3Nm, P=.08). No statistically significant differences were obtained in tissue stiffness in the quadriceps and hamstring with any of the conditions. CONCLUSIONS: Our data suggest that whole-body vibration at a frequency of 26Hz and 40Hz preclude the decline in concentric peak torque of knee extensor observed after 10 bouts of 60 seconds of static half squats. A change in muscle mechanical stiffness property as induced by whole-body vibration is not supported by our data. |
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Authors:
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Parco M Siu; Bjorn T Tam; Daniel H Chow; Jing-Yi Guo; Yan-Ping Huang; Yong-Ping Zheng; Stephen H Wong |
Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Archives of physical medicine and rehabilitation Volume: 91 ISSN: 1532-821X ISO Abbreviation: Arch Phys Med Rehabil Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-09-29 Completed Date: 2010-10-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985158R Medline TA: Arch Phys Med Rehabil Country: United States |
Other Details:
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Languages: eng Pagination: 1608-15 Citation Subset: AIM; IM |
Copyright Information:
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Copyright © 2010 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Health Technology and Informatics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, China. htpsiu@inet.polyu.edu.hk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Cross-Over Studies Humans Knee Joint / physiology* Male Muscle Strength / physiology Muscle, Skeletal / physiology* Physical Therapy Modalities* Range of Motion, Articular Torque* Vibration / therapeutic use* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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